GIGABYTE motherboards featuring Dual BIOS have 2 separate physical BIOS chips. To make it easy, I'll call the first one your "Primary" BIOS and the other your "Spare". If your "Primary" BIOS fails at any time, the "Spare" will automatically take over on your next system boot with little or no down time. Any sort of event that causes the "Primary" BIOS chip to fail, whether it is a virus attacking your system, or a user incorrectly flashing the BIOS, the "Spare" kicks in and gets your system up and running automatically.